Thank you for contacting Intel Embedded Community.
We would like to inform you that the cited Operating system (OS) is unlisted as a supported one. This information is stated on page 3 of the Intel® Atom™ Processor E3800 Product Family Product Brief.
Due to this fact, the requested driver is unavailable.
We hope that this information is useful to you.
Thank you for your suggestion. I believe serial.sys doesn't work in this board using Windows 8.1 or Windows 10.
For installing Windows 10 on this board I need to make the following changes in the BIOS:
LPSS & SCC Devices Mode > Select "ACPI Mode"
OS Selection > Windows8.X
With these changes in the BIOS, I need to install a HS-UART and UART controller sub device driver so that I can test the COM ports using putty or similar tools.
Please let me know if you know where I can find a UART controller sub device driver (Windows 8.1 or 10) for this CPU.